just make sure you don't get to +15 Playful and any Happiness moodlet factors and the hysterical emotion won't occur ;)
I actually have not encountered this so called "bug" yet myself, are you sure you guys just didn't pay close attention if the sim had +15 Playful/happy moodlets?
However I had a few sims die of laughter recently (all intentional off course :D ) but when they do die they just disappear on the lot, no death notification or Grim, just a gravestone in the family inventory. This is the bug at least I know happens with this death at least :o
